If approved manufacturer checklists are unavailable for a 100-hour inspection, which regulation could be referenced?

The correct reference for situations where approved manufacturer checklists are unavailable for a 100-hour inspection is found within 14 CFR Part 43, specifically Appendix D. This part of the Federal Aviation Regulations outlines the minimum requirements for performing an annual and 100-hour inspection of an aircraft, including the necessary inspection items that must be addressed.

In the absence of an approved checklist from the manufacturer, technicians can use this appendix to ensure that they cover all essential areas during the inspection process. It provides a standardized framework that helps maintain safety and compliance with aviation maintenance standards. Thus, referring to this appendix is crucial for ensuring that the inspection is thorough and meets regulatory obligations.

Other options pertain to different aspects of aviation regulations and do not specifically address the situation of conducting inspections without manufacturer checklists.